The reason why many of the machines that sped up production and travel invented during the 18th and 19th centuries is because "<span>D. There was a heightened interest in science during this time," since this was during the age of the Enlightenment. </span>
The answer is A) Homo erectus
Martial law is when a government temporarily suspends the normal laws that run society. Instead of following the normal laws, the military will have direct control over the everyday workings of the government. This rule by military orders can happen for numerous reasons including a state of emergency, an invasion, or another catastrophic event. However, these are very rare as they usually result in the suspension of civilian rights/liberties.